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Zach, whose mass is 80 kg, is in an elevator descending at 10 m/s. The elevator...

Zach, whose mass is 80 kg, is in an elevator descending at 10 m/s. The elevator takes 3.0 s to brake to a stop at the first floor. (a) What is Zach’s weight before the elevator starts braking? (b) What is Zach’s weight while the elevator is braking?

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